Marly Salazar

Staff Software Engineer

LinkedIn logo
Passing a TPU Through to a Paravirtualized Guest A customer asked us to run Google TPUs inside our zones. The obvious way to hand a guest a piece of PCI hardware is IOMMU-backed passthrough, and Xen has supported that for HVM guests for years. Our zones default to PV, without hardware virtualization extensions or a VT-x or AMD-V dependency. That is a big part of why they boot and fork as fast as they do. Moving these workloads to a different guest model would have meant giving up properties we deliberately built the runtime around, so the interesting problem was making passthrough work without changing the execution model. Xen's PV mode had never had an IOMMU story for a domU. Every DMA a PV guest issues goes out under dom0's address space, because PV was designed before device passthrough to an unprivileged domain was something anyone needed from it. The TPU work ended up being three problems stacked on top of each other. We had to give Xen an IOMMU interface a PV guest could actually

October 27, 2026

Passing a TPU Through to a Paravirtualized Guest

Read more
It's Beginning to Look a Lot Like CVE Season: PHP2Shell and Beyond

October 23, 2026

It's Beginning to Look a Lot Like CVE Season: PHP2Shell and Beyond

Read more
The Futility of Threat Modeling AI Agents

October 22, 2026

The Futility of Threat Modeling AI Agents

Read more

Cybersecurity Awareness Month: Start Secure and Stay Secure with Edera

October 9, 2024

Read it Now

A Critical NVIDIA AI Vulnerability and The Principle of Isolation

September 27, 2024

Read it Now

ICYMI: Edera Announced $5M in Seed Funding for the World’s Only Secure-By-Design Kubernetes and AI Solution

September 24, 2024

Read it Now

Edera Raises $5M Seed Round to Introduce the World’s Only Secure-By-Design Kubernetes and AI Solution

September 18, 2024

Read it Now

120 Seconds with Stephen Augustus

September 16, 2024

Read it Now

Escaping the Container Status Quo

August 1, 2024

Read it Now

Pawsitivity: Daisy

July 16, 2024

Read it Now